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Search Results: 1 - 10 of 468299 matches for " Najat A. Mohamed "
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Removal of Aniline Blue from Aqueous Solutions Using Ce1-xBixCrO3 (x = 0, 0.5, 1)  [PDF]
Labib A. Awin, Mahmoud A. El-Rais, Abdunnaser M. Etorki, Najat A. Mohamed, Wesal A. Makhlof
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2018, DOI: 10.4236/ojinm.2018.81001
Abstract: The removal of aniline blue dye from aqueous solutions using the A-site doped perovskite Ce1-xBixCrO3 (x = 0, 0.5, 1) was investigated. The perovskite oxides were synthesised using Sol-Gel method and characterised by conventional powder X-ray diffraction technique. The X-ray diffraction measurements suggested that doping with Bismuth Ion influences both the crystal structure and the particle size of the oxides, and consequently affects the adsorption properties. It was found that both CeCrO3 and Ce0.5Bi0.5CrO3 compounds are orthorhombic and have approximate particle size of 87 and 36 nm respectively, whereas BiCrO3 oxide has rhombohedral space group symmetry and the particle sizes are less than 49 nm. The batch mode study demonstrated that the removal capacities of Aniline Blue at 150 min and pH = 4.3 for Ce0.5Bi0.5CrO3, CeCrO3 and BiCrO3 are 779.67, 705.45 and 440.18 mg/g respectively. The results reflect the influence of the A site doping on the adsorption properties of the oxides. The removal of Aniline Blue was found to be negatively correlated with temperature and pH.
Pulsed and Tissue Doppler Echocardiographic Abnormalities in Patients with Diastolic Heart Failure with and without Atrial Fibrillation  [PDF]
Taysir Said Garadah, Najat Hassan Mahdi, Mohamed Ahmed Al Alwai, Ahmed Abdulkareem Jaradat, Zuheir Ahmed Hasan
International Journal of Clinical Medicine (IJCM) , 2012, DOI: 10.4236/ijcm.2012.37118
Abstract:

Background: Symptoms of heart failure (HF) are identical in both systolic (SHF) and diastolic hear failure (DHF). The prevalence of atrial fibrillation (AF) in heart failure varies in different studies depending on the criteria of enrollment and the use of echocardiographic parameters in the definition of HF. Aim: To assess the clinical characteristic of pa- tients with DHF complicated by AF and compare with those with SHF in regard of echocardiographic abnormalities and causative agents. Furthermore, evaluate the clinical and biochemical markers for the prediction of AF in HF. Method: Over the duration of 12 months, each patient diagnosed as HF based on admission code was enrolled in the study. Patients were classified into two groups: group 1: DHF, with preserved LVPEF% > 50%, n = 204 (60%), and group 2, with SHF, with LVREF% ≤ 50%, n = 140 (40%). The presence or absence of AF on ECG was recorded. The predictive value of different clinical and biochemical variables for the development of AF was evaluated using logistic multiple regression analysis. Results: Three hundred and forty four eligible patients were admitted to hospital with heart failure out of 7650 who had other medical problems. The prevalence of HF in this population was 4.5%, those with DHF were 2.7% and SHF of 1.8%. The incidence of AF on ECG was 35% in the whole study population and 65% were in sinus rhythm (SR). The occurrence of AF was twice higher in DHF patients of 22% compared with 11% in SHF. Echo pulsed Doppler in DHF and AF compared with those in SR showed a severe restrictive pattern with significantly thick septum wall, higher LV mass index, shorter DT and higher E/e? ratio of 12.4 vs. 9.73, P < 0.05. The

Natural Radioactivity in Soil and Water from Likuyu Village in the Neighborhood of Mkuju Uranium Deposit
Najat K. Mohammed,Mohamed S. Mazunga
International Journal of Analytical Chemistry , 2013, DOI: 10.1155/2013/501856
Abstract: The discovery of high concentration uranium deposit at Mkuju, southern part of Tanzania, has brought concern about the levels of natural radioactivity at villages in the neighborhood of the deposit. This study determined the radioactivity levels of 30 soil samples and 20 water samples from Likuyu village which is 54?km east of the uranium deposit. The concentrations of the natural radionuclides 238U, 232Th, and 40K were determined using low level gamma spectrometry of the Tanzania Atomic Energy Commission (TAEC) Laboratory in Arusha. The average radioactivity concentrations obtained in soil samples for 238U (51.7?Bq/kg), 232Th (36.4?Bq/kg), and 40K (564.3?Bq/kg) were higher than the worldwide average concentrations value of these radionuclides reported by UNSCEAR, 2000. The average activity concentration value of 238U (2.35?Bq/L) and 232Th (1.85?Bq/L) in water samples was similar and comparable to their mean concentrations in the control sample collected from Nduluma River in Arusha. 1. Introduction The radioactivity level from the natural radionuclides is termed as background radiation which will depend on the amount of the radioactive materials in the environment. The background radiation can be high if the environment is polluted either from man-made or natural activities. It can also be high in regions with deposit of mineral resources such as uranium ores and phosphate [1]. Materials from the deposit may be brought to the surface soil through processes such as weathering of rocks and soil formation. They can also leach into the groundwater system, contaminate it, and lead to pollution far away from the source. In Tanzania, high concentrations of uranium deposits of up to 464?ppm have recently been reported at Mkuju in Namtumbo area at Ruvuma region. This has brought concern about the level of natural radioactivity in the soil and drinking water at villages in the neighborhood of the deposit. This is because there are reports in the literature which indicate high radioactivity levels in regions near uranium deposits [2, 3]. Rabesiranana et al. (2008) in Madagascar and Sartandel et al. (2009) in India reported enhanced level of 238U and 232Th in the soil around uranium deposits as compared to the world average [2, 4]. Enkhbat et al. (2008) reported high activity concentration of 226Ra, 232Th, and 40K in soil around Gurvanbulag uranium deposit in the eastern part of Mongolia [3]. The present study has determined concentration levels of the 238U decay series and the 232Th decay series as well as 40K in soil and water from Likuyu village which is 54?km
Glutamate and Caffeine intake of Some Snacks and Drinks in Saudi Arabia  [PDF]
Magda I. Hassan, Najat A. Al-Abbad
Food and Nutrition Sciences (FNS) , 2011, DOI: 10.4236/fns.2011.22023
Abstract: The aim of this study was to estimate the intake level of glutamate and caffeine from some snacks and drinks. The survey was carried out during 2008 to 2009 in 3 selected governorates (Al-Hassa, Al- Katif and AD-Dammam) localized in the eastern area of Saudi Arabia. The age of study participants (298) was ranged between less than 4 – over 30 years. The snacks and drinks consumption data were gathered and calculated using the frequency methods. Forty nine samples of snacks and beverages were analyzed by High Performance Liquid Chromatography (HPLC) for glutamate and caffeine contents. The results indicated that total intake of snacks, chocolates and drinks were significantly correlated (spearman r = 0.856, 0.591, 0.943, p = 0.0) with total intake of glutamate and caffeine. The mean of caffeine intake was 40.4± 44.5 mg, while the mean of glutamate intake was 0.134± 0.146 mg. The highest concentration of glutamate was in Pringles with Ketchup (0.420), Bugles Smoking BBQ (0.660) and Indomie with Vegetables (0.860). The high caffeine concentrations of Kit Kat, Ulker and Galaxy samples were 166, 165.5, and 134.5 mg/kg respectively, while the beverages, the high caffeine concentrations were presented in energy drinks like Red bull (345.5), Power Horse (339.0) and Bugzy(333.0) mg/L. The children aged between 4– 8 were the most consumers of snacks which containing glutamate, while the adolescents consumed more chocolates and beverages which containing caffeine. These finding suggests that consumption of salty snacks, and sugar-sweetened beverages is mounting between important categories in the community, so interventions focusing on increasing physical activity and fruit and vegetable consumption will have an impact on obesity control and promoting health.
Ethyl 3-[6-(4-methoxybenzenesulfonamido)-2H-indazol-2-yl]propanoate monohydrate
Najat Abbassi,El Mostapha Rakib,Abdellah Hannioui,Mohamed Saadi
Acta Crystallographica Section E , 2013, DOI: 10.1107/s1600536812051975
Abstract: In the title compound, C19H21N3O5S·H2O, the central indazole system is essentially planar (r.m.s. deviation = 0.012 ), while both the benzene ring and the mean plane defined by the non-H atoms of the ethyl propionic ester unit (r.m.s. deviation = 0.087 ) are nearly perpendicular to the indazole plane, as indicated by the dihedral angles of 82.45 (8) and 75.62 (8)°, respectively. Consequently, the molecule adopts a U-shaped geometry. In the crystal, the water molecule, which is linked to the indazole system by a strong O—H...N hydrogen bond, is also involved in two additional N—H...O and O—H...O interactions, which link the organic molecules into chains along the b-axis direction.
5,11-Ditosyl-5H,11H-dibenzo[b,f][1,5]diazocine-6,12-dione acetic acid hemisolvate
Najat Abbassi,Oulemda Bassou,El Mostapha Rakib,Mohamed Saadi
Acta Crystallographica Section E , 2013, DOI: 10.1107/s1600536813007903
Abstract: The molecular structure of the title compound, C28H22N2O6S2·0.5CH3COOH, is built up from three fused rings, two six and one eight membered. The eight-membered ring shows a boat conformation and the dihedral angle between the two benzene groups attached thereto is 66.43 (11)°, resulting in a V-shaped geometry. Two tosyl substituents are bound to the N atoms. The planes through the tolyl rings are roughly perpendicular, as indicated by the dihedral angle of 82.44 (12)°. In the crystal, the molecule and its inversion-related symmetry-equivalent are linked to the acetic acid solvent molecule by non-classical O—H...O and C—H...O hydrogen bonds. Two half-occupied acetic acid solvent molecules are disordered at the same site and linked by a center of symmetry.
Ecological similarities between two Mediterranean wetlands: Sidi Boughaba (North-West Morocco) and the Do ana National Park (South-West Spain)
Najat Elkhiati,Mohamed Ramdani,José L. Espinar,Khalid Fahd
Journal of Limnology , 2013, DOI: 10.4081/jlimnol.2013.e24
Abstract: Addressing the underlying common processes within aquatic systems located in the same geographical region has long been used as a tool for the advancement of limnology. A limnological study of the Merja Sidi Boughaba in 2009 has shown that there are many common features between the physico-chemical and biological conditions of this site and previous data reported from some of the wetlands of the Do ana National Park (South-West Spain). Both are Ramsar sites located on extensive dune systems of the Atlantic coast with a Mediterranean climate. They have a common palaeoenvironmental history that is largely responsible for their similar hydrology and water composition. Oceanic influence has probably produced a slight disproportion of Mg2+ over Ca2+ through airborne sea salt deposition and the surface evaporation of groundwater feeding these wetlands during annual flood and drought cycles. The wide spectrum of environmental conditions encountered in the Do ana wetlands is epitomised by the Merja Sidi Boughaba, where water and sediment gradually change in the same water body from north to south: from humic-coloured waters and a sandy substrate to a calcium-rich substrate with turbid and silted waters which eventually dry out. As a consequence, the community of submersed macrophytes is very rich and dominated by dense charophyte beds. The high primary production coupled with high biodiversity found in the Merja Sidi Boughaba is also shared by the Do ana wetlands. The high conservation status of both sites enables a useful comparison to be made of the water quality of shallow aquatic systems at a regional scale which, contrary to the trophic classifications developed for deep stratified lakes in temperate regions, is not based on regressions between the concentrations of chlorophyll and total phosphorus (Tot-P) but on the proportions of dissolved and particulate P pools. In these Mediterranean sites, nutrients are more efficiently recycled through the sediment (whether deposited at the bottom or suspended in the water column) while seasonal fluctuations of the water level are stronger than in deep stratified lakes and, hence, no significant correlation was found between chlorophyll and either total or particulate P in our study.
The Prevalence of Adrenal, Parathyroid and Cardiac Dysfunction in Patients with Beta Thalassemia Major  [PDF]
Najat E. Mahdi, Taysir S. Garadah, Zuheir Hassan, Ahmed A. Jaradat, Das S. Nagalla
International Journal of Clinical Medicine (IJCM) , 2013, DOI: 10.4236/ijcm.2013.47058
Abstract: Background: Adrenal and parathyroid insufficiency are uncommon in patients with transfusion dependent Beta Thalassemia (β-TM). Further, myocardial echocardiographic abnormalities are recognized but with a variable outcomes Aim: The aim is to determine the prevalence of adrenal and parathyroid insufficiency in patient with transfusion dependent β-TM. And to assess left ventricle systolic and diastolic function using Pulsed Doppler (PD) and Tissue Doppler (DT) echocardiogram. Methods:The study was conducted on patients with β-TM (n = 99, age 15.92 ± 8.92 years) and compared with an age-matched controls (n = 98 age 15.79 ± 8.94 years). In all participants echocardiographic indices of M mode and PD and TD were performed. Blood samples were withdrawn for measuring the serum cortisol, parathyroid and Ferritin. Correlation between the level of cortisol and ferritin level was evaluated. Results: Patients with β-TM compared with controls, had significantly thicker LV septal wall index of 0.65 ± 0.26 vs 0.44 ± 0.2190, p < 0.001 and LV posterior wall of 0.65 ± 0.235 vs 0.43 ± 0.214, p < 0.001, with no significant dilation of LV cavity in systole and diastole. The systolic function of LVFE% was normal of 51.95 ± 5.5 vs 5.0 ± 5.6, p = 0.23. Furthermore patients with β-TM had higher E/A ratio (1.54 ± 0.18 vs 1.23 ± 0.17, p < 0.01) and shorter deceleration time (DT) (170.53 ± 13.3 vs 210.50
A Particle Swarm Optimization Algorithm for a 2-D Irregular Strip Packing Problem  [PDF]
Mohamed A. Shalaby, Mohamed Kashkoush
American Journal of Operations Research (AJOR) , 2013, DOI: 10.4236/ajor.2013.32024
Abstract:

Two-Dimensional Irregular Strip Packing Problem is a classical cutting/packing problem. The problem is to assign, a set of 2-D irregular-shaped items to a rectangular sheet. The width of the sheet is fixed, while its length is extendable and has to be minimized. A sequence-based approach is developed and tested. The approach involves two phases; optimization phase and placement phase. The optimization phase searches for the packing sequence that would lead to an optimal (or best) solution when translated to an actual pattern through the placement phase. A Particle Swarm Optimization algorithm is applied in this optimization phase. Regarding the placement phase, a combined algorithm based on traditional placement methods is developed. Competitive results are obtained, where the best solutions are found to be better than, or at least equal to, the best known solutions for 10 out of 31 benchmark data sets. A Statistical Design of Experiments and a random generator of test problems are also used to characterize the performance of the entire algorithm.

Large Adrenal Pseudocyst: A Case Report  [PDF]
Mohamed Amine Azami, Othman Lahbali, Iliass El Alami, El Amine Ratbi, Fouad Zouidia, Najat Mahassini
Surgical Science (SS) , 2017, DOI: 10.4236/ss.2017.85023
Abstract: Introduction: Cysts of the adrenal gland are rare and are usually discovered incidentally, typically presented with abdominal pain or palpable mass. There are four categories of adrenal gland cyst: epithelial, endothelial, parasitic and pseudocysts. We report the case of a 33-year-old woman who presented as a pain of the right hypochondrium and abdominal distention and was diagnosed with a large unilateral adrenal pseudocyst. Case presentation: A 33-year-old Moroccan woman followed for acute articular rheumatism for 3 years was admitted with left hypochondralgia and abdominal distention. Magnetic resonance imaging. (MRI) and abdominal computed tomography revealed a large left adrenal cyst mass measuring 19 cm. The patient underwent surgery, and the cyst was completely removed. Histological examination revealed an adrenal pseudocyst. Symptoms resolved after pseudocyst removal. Conclusion: Adrenal pseudocysts are uncommon. Symptoms are usually related to the size and local pressure effect of the cysts.
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